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INVESTMENTS - Net Investment gains (losses) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gross realized investment gains
Fixed maturities and short-term investments									$ 93,160	$ 46,067	$ 72,046
Equity securities									3,449	20,435	78,343
Gross realized investment gains									96,609	66,502	150,389
Gross realized investment losses
Fixed maturities and short-term investments									(56,515)	(142,153)	(98,442)
Equity securities									(323)	(3,389)	(959)
Gross realized investment losses									(56,838)	(145,542)	(99,401)
Net OTTI charge recognized in net income									(6,984)	(9,733)	(14,493)
Change in fair value of investment derivatives									(1,823)	5,445	(8,269)
Change in fair value of equity securities									60,269	(66,890)	0
Total net investment gains (losses)	$ 42,712	$ 14,527	$ 21,225	$ 12,767	$ (72,667)	$ (17,628)	$ (45,093)	$ (14,830)	$ 91,233	$ (150,218)	$ 28,226

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- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities, the change in fair value of investment-related derivatives not designated as hedges and any hedge ineffectiveness recognized in earnings in relation to investment portfolio-related fair value hedges.

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Amount of realized gain on investment in debt and equity securities.

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Debt and Equity Securities, Realized Gain [Abstract]

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Amount of realized loss on investment in debt and equity securities.

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Debt and Equity Securities, Realized Loss [Abstract]

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio.

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.

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